CN113426248A - Application of ionic liquid composite metal framework material in capturing NO - Google Patents

Application of ionic liquid composite metal framework material in capturing NO Download PDF

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CN113426248A
CN113426248A CN202110810218.3A CN202110810218A CN113426248A CN 113426248 A CN113426248 A CN 113426248A CN 202110810218 A CN202110810218 A CN 202110810218A CN 113426248 A CN113426248 A CN 113426248A
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郑文涛
巫先坤
孙世新
徐国栋
方东
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Yancheng Teachers University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1493—Selection of liquid materials for use as absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/30—Ionic liquids and zwitter-ions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/20—Organic adsorbents
    • B01D2253/204—Metal organic frameworks (MOF's)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide

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Abstract

The invention discloses an application of an ionic liquid composite metal framework material in capturing NO. The composite material IL-MIL-101-Cr obtained by combining the ionic liquid IL and the metal framework material MIL-101-Cr is used for capturing NO. Compared with the prior art, the invention has the advantages that: (1) the raw materials are easy to obtain, the operation process is simple, and the requirement on equipment is not high; (2) compared with other publicly reported NO gas adsorption materials, the prepared IL-MIL-101-Cr composite material has remarkable effect, and can be used in the fields of aerospace, aviation, navigation, deep sea operation and the like; (3) the composite material is convenient to recover, can be repeatedly used, is environment-friendly and is easy to industrially amplify.

Description

Application of ionic liquid composite metal framework material in capturing NO
Technical Field
The invention relates to a composite material constructed by a metal frame material based on single metal Cr and an ionic liquid, and an application method for capturing and absorbing NO gas under a natural temperature condition, belonging to the fields of resources, environment and new materials.
Background
Nitric Oxide (NO), a colorless, odorless gas that is poorly soluble in water, is chemically very reactive due to its free radicals, and when it reacts with oxygen, it forms a corrosive gas, nitrogen dioxide (NO)2），NO2Can be mixed with waterNitric acid is generated by the reaction to form acid mist and acid rain; NO has strong oxidizing property, is easy to ignite and burn when being contacted with inflammable substances and organic substances, and can emit brown yellow fog with acidic oxidizing property when being contacted with air; further, NO are included2The nitrogen oxides (NOx) in the air cause damage to the respiratory system and nervous system; particularly, research even finds that NO is also an inland of syncope attacks when astronauts go to and fro the earth and space, which is undoubtedly a potential hidden danger for human advancing to space and soaring universe. Therefore, the reduction of NO gas emission, the capture control of the existing NO gas and the like are important measures for treating nitrogen oxide pollution in the atmosphere, controlling acid mist and acid rain, protecting the environmental safety and protecting the human health.
The main measure for reducing NO emission is to change the power of the automobile: such as the development of electric vehicles and alternative fuel vehicles; improve current automobile power device and fuel quality: the adoption of an engine with excellent design, the improvement of a combustion chamber structure, the adoption of a new material, the improvement of fuel quality and the like can reduce the exhaust pollution of the automobile, but zero emission cannot be achieved; widely used purification technologies suitable for a large number of in-use vehicles and new vehicles: the method adopts some advanced external purification technologies to purify the waste gas generated by the automobile so as to reduce pollution, and the approach can not achieve zero pollution.
The existing main treatment method of oxynitride waste gas can be divided into a catalytic reduction method, an absorption method and an adsorption method according to different purification action principles: 1. a catalytic reduction method: reducing NOx in exhaust gas to non-polluted N under the conditions of high temperature and catalyst existence2Because the reaction temperature is higher, and a catalyst is needed at the same time, the equipment investment is larger, and the operation cost is larger; 2. an adsorption method: the method mainly utilizes an absorbing material and an adsorbent to absorb NOx in the atmosphere, and is only suitable for waste gas treatment with low NOx concentration and small gas amount due to small adsorption capacity; 3. absorption method: water or water solution of acid, alkali and salt is used to absorb nitrogen oxide in waste gas to purify waste gas. The method has the advantages of low equipment investment and low operation cost, but because the absorbent is aqueous solution, the method is difficult to implement in places with high requirements on humidity or places with harsh working conditions.
The metal frame material of the single metal Cr has application in the aspect of gas separation, and the alkaline ionic liquid has application in the aspect of gas adsorption, but is basically applied to CO alone2、CO、NH3The absorption of gases is separated, but the application of the absorption of NO gas is less. Therefore, the method adopts the composite material which is simple and convenient to operate, adopts the ionic liquid as the gas adsorbent, adopts the MIL-101-Cr as the metal framework material, and combines the ionic liquid and the MIL-101-Cr to obtain the composite material for capturing NO.
Disclosure of Invention
The invention aims to provide a novel method for applying an ionic liquid composite metal framework material to capture NO, which mainly adopts ionic liquid IL as a gas adsorbent, MIL-101-Cr as a metal framework material, and the composite material IL-MIL-101-Cr obtained by combining the IL with the MIL-101-Cr is used for capturing NO.
The technical scheme for realizing the aim of the invention is that the prepared MIL-101-Cr is used as a metal frame material precursor, the ionic liquid IL is used as a gas adsorbent, and the IL and the MIL-101-Cr are combined to obtain a composite material IL-MIL-101-Cr, so that the NO is efficiently captured; wherein the specific steps of the construction of the IL-MIL-101-Cr are as follows:
step 1) preparation of MIL-101-Cr: adding a certain amount of CrCl3·6H2O, terephthalic acid, 1-butyl-3-methylimidazole hydrochloride and a certain amount of high-purity water are sequentially added into a polytetrafluoroethylene lining, a sealed reaction kettle is placed in an oven at 200 ℃ for reaction for 10 hours, after the reaction is finished, the solution is naturally cooled to room temperature, the solution is sequentially washed for 3 times by using the high-purity water and an absolute ethyl alcohol solvent respectively, and finally the solution is dried for 2 hours in a vacuum drying oven at 100 ℃ to obtain a green powder sample, namely the target intermediate MIL-101-Cr.
Step 2) preparation of the composite material IL-MIL-101-Cr: sequentially adding the metal framework material MIL-101-Cr obtained in the step 1, polyamine and a certain amount of toluene into a reaction kettle, stirring for 2 hours at normal temperature and normal pressure, carrying out programmed heating, wherein the heating rate is 1 ℃/min, heating to 80 ℃ and keeping constant temperature, continuously stirring for 8 hours, then naturally cooling to normal temperature under the stirring condition, adding phenol with the same mole as that of the polyamine, carrying out programmed heating, the heating rate is 0.5 ℃/min, slowly heating to 80 ℃, keeping constant temperature, stirring for 15 hours, stopping stirring, naturally cooling to normal temperature, standing overnight, carrying out suction filtration on the obtained mixture, sequentially washing with absolute ethyl alcohol and deionized water for three times respectively, and carrying out vacuum drying for 2 hours at 60 ℃ to obtain an off-white composite material IL-MIL-101-Cr; wherein, the polyamine is triethylene tetramine or tetraethylene pentamine, or a mixture formed by mixing the two polyamines according to any mass ratio; the phenol is phenol or guaiacol, or a mixture of two phenols in any mass ratio, and the total mole number of the phenol is equal to that of the polyamine.
In the preparation process of the composite material IL-MIL-101-Cr, the load capacity of the ionic liquid IL is 20-50% of the mass of the MIL-101-Cr metal framework material, and the proportion can be regulated and controlled according to requirements.
In the application process of capturing NO by the ionic liquid composite metal framework material, firstly, a certain amount of IL-MIL-101-Cr is weighed in an absorption cell, NO with different pressures is introduced at 40 ℃ and is continuously stirred, the absorption amount of NO is calculated through the pressure change in the absorption cell after the absorption is balanced, and the loading amount of NO in the composite material is 0.60 mmol/g (Pe = 0.1 bar) under different partial pressures (Pe); 1.32 mmol/g, (Pe = 0.2 bar); 2.14 mmol/g, (Pe = 0.3 bar); 3.17 mmol/g, (Pe = 0.4 bar); 4.15 mmol/g, (Pe = 0.5 bar); 7.23 mmol/g, (Pe = 1 bar); 13.29 mmol/g, (Pe = 2 bar); 16.80 mmol/g, (Pe = 3 bar); the absorption pressure is 0.001-3 bar, wherein the preferable absorption pressure is 1 bar; the absorption temperature is 20-100 ℃, wherein the preferable absorption temperature is 40 ℃.
In the application process of capturing NO by the ionic liquid composite metal frame material, the application method of absorbing NO further comprises the regeneration process of an absorbent after absorption, the composite material IL-MIL-101-Cr which has absorbed NO is placed in a sealed tank with the pressure of 0.005 bar, the desorption temperature is controlled to be 80 ℃, the desorption equilibrium time is 1 hour, and the desorption residual quantity is 0.12 mmol/g; wherein the desorption temperature is 60-120 ℃, and the preferred desorption temperature is 80 ℃; the regeneration time is 0.1-3 h, and the preferable regeneration time is 1 h.
The key technology of the technical solution for realizing the aim of the invention is as follows: firstly, preparing a metal framework material MIL-101-Cr as a precursor carrier in a hydrothermal reaction kettle, stirring the metal framework material MIL-101-Cr with polyamine in a toluene reaction medium for 2 hours at normal temperature and normal pressure, carrying out temperature programming, raising the temperature to 80 ℃ at the rate of 1 ℃/min, continuing stirring for 8 hours, and then naturally cooling to the normal temperature under the stirring condition. And then adding phenol which is equimolar with polyamine, carrying out programmed temperature rise at the temperature rise rate of 0.5 ℃/min, slowly raising the temperature to 80 ℃, and continuously stirring for 15 hours at a constant temperature, wherein the technical purpose of the process is to ensure that the phenol can also keep a certain molecular concentration inside and outside the metal framework material and can also achieve a dynamic balance, and the phenol can react with the polyamine no matter inside or outside the framework to obtain the ionic liquid IL. The technical purpose is to enable IL to keep a certain ion concentration inside and outside a metal framework material, the volume of the IL inside the framework is increased after reaction, so that the IL is trapped inside the framework, the IL outside the framework is free, the IL is sequentially washed three times by absolute ethyl alcohol and deionized water after suction filtration, the IL outside the framework is washed into filtrate, the IL inside the framework is trapped inside the framework due to the trapping, the composite material exists in a solid form and is filtered, and the IL-MIL-101-Cr composite material with a certain load is obtained after vacuum drying for 2 hours at 60 ℃.
Wherein, the polyamine is triethylene tetramine or tetraethylene pentamine, or a mixture formed by mixing the two polyamines according to any mass ratio, and the preferable polyamine for comprehensive performance evaluation is tetraethylene pentamine; the phenol is phenol or guaiacol, or a mixture formed by mixing two phenols according to any mass ratio, and the preferable phenol for comprehensive performance evaluation is guaiacol, because the phenol is an acidic substance contained in natural wood, belongs to a renewable resource, and is relatively environment-friendly to the environment and human body; the total moles of phenol are equal to the total moles of polyamine to ensure equimolar reaction of polyamine and phenol to form IL.
Compared with the prior art, the invention has the advantages that: (1) the preparation process only uses two conventional heating modes of a hydrothermal method and an oil bath method, complex processes such as high-temperature calcination in a muffle furnace and a tubular furnace, inert gas protection and the like are not needed, the operation process is simple, the preparation is convenient, and the requirement on equipment is low; (2) compared with the absorption of other liquid NO gas adsorbents which are reported in the prior art, the prepared composite material IL-MIL-101-Cr has remarkable improvement on the absorption effect under the condition of the same parameters, because the composite material is of a metal frame structure, the external macroscopically loose accumulation state is always kept, the influence on the gas fluidity and penetrability is basically avoided, the composite material is insensitive to the external temperature change, the advantages of the composite material in deep sea operation with higher pressure or high altitude areas with the temperature lower than 0 ℃ are more prominent, the IL-MIL-101-Cr has NO any requirements on humidity, temperature, pressure, stirring speed and the like within the process parameter range of the invention, and meanwhile, the metal frame material has better tolerance on acid, alkali, especially salt, and the application broad spectrum is incomparable to all reported liquid NO adsorbents, and can be applied to aviation, Aerospace, navigation, seabed operation, big data center and other major high-tech fields; (3) in the whole preparation process, deionized water, ethanol and toluene are used as reaction media or detergents, the whole reaction and post-treatment process is safe and stable, the solvents such as ethanol and toluene can be recycled and reused, and the method is environment-friendly and easy for industrial amplification.
Drawings
FIG. 1 is an XRD diffractogram of MIL-101-Cr, IL-MIL-101-Cr before and after adsorption, and regenerated IL-MIL-101-Cr. The method comprises the following steps from top to bottom: MIL-101-Cr, IL-MIL-101-Cr before adsorption, IL-MIL-101-Cr after regeneration for 1-4 times, and a standard simulation diagram.
FIG. 2 is a graph of the NO loading captured by IL-MIL-101-Cr versus the partial pressure of NO (Pe).
Detailed Description
The following examples further illustrate the invention in order to provide a better understanding of the invention. The examples do not limit the scope of the invention in any way. Modifications and adaptations of the present invention within the scope of the claims may occur to those skilled in the art and are intended to be within the scope and spirit of the present invention.
Example 1
Preparing MIL-101-Cr: adding CrCl3·6H2O (2.66 g, 0.01 mol), terephthalic acid (1.66 g, 0.01 mol), 1-butyl-3-methylimidazole hydrochloride (0.1 g) and 80 mL of high-purity water are sequentially added into a 100 mL polytetrafluoroethylene lining, a sealed reaction kettle is placed in a 200 ℃ oven for reaction for 10 h, after the solution is naturally cooled to room temperature, the solution is sequentially washed 3 times by high-purity water and absolute ethyl alcohol solvent, and finally dried in a 100 ℃ vacuum drying oven for 2 h to obtain 3.0 g of light green powder sample which is named as MIL-101-Cr.
Preparation of IL-MIL-101-Cr: sequentially adding 1.0 g of MIL-101-Cr obtained in the previous step, 1.0 g of tetraethylenepentamine and 30 g of toluene into a reaction kettle, stirring for 2 hours at normal temperature and pressure, carrying out programmed heating at the heating rate of 1 ℃/min, heating to 80 ℃ and keeping stirring for 8 hours, then naturally cooling to normal temperature under the stirring condition, adding guaiacol which is equal to the tetraethylenepentamine in mole, carrying out programmed heating at the heating rate of 0.5 ℃/min, slowly heating to 80 ℃, keeping stirring for 15 hours at the constant temperature, stopping stirring, naturally cooling to normal temperature, standing overnight, carrying out suction filtration on the obtained mixture, sequentially washing with absolute ethyl alcohol and deionized water for three times respectively, carrying out vacuum drying for 2 hours at 60 ℃ to obtain 1.5 g of off-white composite material IL-MIL-101-Cr, and thus obtaining the compound IL-MIL-101-Cr, the loading amount of the ionic liquid IL is 50 percent of the mass of the MIL-101-Cr metal framework material.
Example 2
Preparation of IL-MIL-101-Cr: sequentially adding 1.0 g of MIL-101-Cr obtained in example 1, 1.0 g of triethylene tetramine and 25 g of toluene into a reaction kettle, stirring for 2 hours at normal temperature and pressure, carrying out programmed heating at a heating rate of 1 ℃/min, heating to 80 ℃ and keeping stirring for 8 hours, then naturally cooling to normal temperature under stirring, adding guaiacol which is equal to the triethylene tetramine in mole, carrying out programmed heating at a heating rate of 0.5 ℃/min, slowly heating to 80 ℃, keeping stirring at constant temperature for 15 hours, stopping stirring, naturally cooling to normal temperature, standing overnight, carrying out suction filtration on the obtained mixture, sequentially washing with absolute ethyl alcohol and deionized water for three times, carrying out vacuum drying at 60 ℃ for 2 hours to obtain 1.35 g of off-white composite material IL-MIL-101-Cr, and thus obtaining the IL-MIL-101-Cr, the loading amount of the ionic liquid IL is 35 percent of the mass of the MIL-101-Cr which is taken as the metal framework material.
Example 3
Preparation of IL-MIL-101-Cr: sequentially adding 1.0 g of MIL-101-Cr obtained in example 1, 0.5 g of tetraethylenepentamine, 0.5 g of triethylene tetramine and 30 g of toluene into a reaction kettle, stirring for 2 hours at normal temperature and pressure, carrying out programmed heating at the heating rate of 1 ℃/min, heating to 80 ℃ and continuously stirring for 8 hours at a constant temperature, then naturally cooling to normal temperature under the stirring condition, adding guaiacol which is equal to polyamine in mole, carrying out programmed heating at the heating rate of 0.5 ℃/min, slowly heating to 80 ℃, continuously stirring for 15 hours at a constant temperature, stopping stirring, naturally cooling to normal temperature, standing overnight, carrying out suction filtration on the obtained mixture, sequentially washing with absolute ethyl alcohol and deionized water for three times, carrying out vacuum drying at 60 ℃ for 2 hours to obtain 1.43 g of off-white composite material IL-MIL-101-Cr, therefore, the loading of the ionic liquid IL can be calculated to be 43 percent of the mass of the MIL-101-Cr metal framework material.
Example 4
Preparation of IL-MIL-101-Cr: sequentially adding 1.0 g of MIL-101-Cr obtained in example 1, 0.4 g of tetraethylenepentamine and 20 g of toluene into a reaction kettle, stirring for 2 hours at normal temperature and pressure, carrying out programmed heating at the heating rate of 1 ℃/min, heating to 80 ℃ and keeping stirring for 8 hours at a constant temperature, naturally cooling to normal temperature under the stirring condition, adding guaiacol which is equal to tetraethylenepentamine in mole, carrying out programmed heating at the heating rate of 0.5 ℃/min, slowly heating to 80 ℃, keeping stirring for 15 hours at a constant temperature, stopping stirring, naturally cooling to normal temperature, standing overnight, carrying out suction filtration on the obtained mixture, sequentially washing with absolute ethyl alcohol and deionized water for three times, carrying out vacuum drying for 2 hours at 60 ℃ to obtain 1.2 g of off-white composite material IL-MIL-101-Cr, and thus obtaining the compound by calculation, the loading amount of the ionic liquid IL is 20 percent of the mass of the MIL-101-Cr of the metal framework material.
Example 5
Weighing 1.0 g of IL-MIL-101-Cr prepared in example 1 in an absorption cell (62.9952 mL), introducing NO at different pressures at 40 ℃ and continuously stirring, calculating the absorption amount of NO through the pressure change in the absorption cell after the absorption reaches the equilibrium, wherein the loading amount of NO in the composite material is 0.60 mmol/g under different partial pressures (Pe), (Pe = 0.1 bar); 1.32 mmol/g, (Pe = 0.2 bar); 2.14 mmol/g, (Pe = 0.3 bar); 3.17 mmol/g, (Pe = 0.4 bar); 4.15 mmol/g, (Pe = 0.5 bar); 7.23 mmol/g, (Pe = 1 bar); 13.29 mmol/g, (Pe = 2 bar); 16.80 mmol/g, (Pe = 3 bar); in order to express the adsorption effect more intuitively, FIG. 2 is a graph of the relationship between the loading amount (mmol/g) of IL-MIL-101-Cr to NO and the partial pressure Pe (bar) of NO gas. It can be seen that the trapping amount of NO by the material is in a direct proportion relation with the gas partial pressure Pe, and for the existing liquid absorbent, the partial pressure increases the volume of the liquid to be reduced, the viscosity is increased, the stirring resistance is increased, so that the absorption effect is influenced, and the NO loading amount is accelerated slowly; the IL-MIL-101-Cr has good pressure resistance, and on the other hand, when Pe is low, the IL-MIL-101-Cr also has good NO capture capacity, and is equivalent to the publicly reported liquid adsorbent, particularly the IL-MIL-101-Cr has very stable NO capture effect, and can stably and durably capture NO NO matter how the gas partial pressure Pe changes.
Example 6
1 g of IL-MIL-101-Cr which has absorbed NO in example 5 is placed in a sealed tank with the pressure of 0.005 bar, the desorption temperature is controlled to be 80 ℃, the desorption equilibrium time is 1 h, the desorption residual quantity is 0.12 mmol/g, and then the second capture of NO is carried out completely according to the method of example 5, and the result shows that the absorption temperature is 40 ℃, the absorption pressure is 0.1-3 bar, the loading quantity of IL-MIL-101-Cr to NO is basically leveled with the parallel comparison of example 5, and the trend line is consistent with the attached figure 2.

Claims (3)

1. The application of the ionic liquid composite metal framework material for capturing NO is characterized in that: the method comprises the following steps of (1) adopting ionic liquid as a gas adsorbent, MIL-101-Cr as a metal framework material, and obtaining a composite material by combining the ionic liquid and the MIL-101-Cr for capturing NO, wherein the composite material IL-MIL-101-Cr formed by the ionic liquid and the MIL-101-Cr is constructed by the following specific steps:
step 1) preparation of MIL-101-Cr: adding a certain amount of CrCl3·6H2Sequentially adding O, terephthalic acid, 1-butyl-3-methylimidazole hydrochloride (0.1 g) and a certain amount of high-purity water into a polytetrafluoroethylene lining, sealing a reaction kettle, placing the reaction kettle in an oven at 200 ℃ for reaction for 10 hours, after the reaction is finished, naturally cooling the solution to room temperature, sequentially washing the solution for 3 times by using high-purity water and an absolute ethyl alcohol solvent respectively, and finally drying the solution in a vacuum drying oven at 100 ℃ for 2 hours to obtain a green powder sample MIL-101-Cr;
step 2) preparation of the composite material IL-MIL-101-Cr: sequentially adding the metal framework material MIL-101-Cr obtained in the step 1, a certain amount of polyamine and a certain amount of toluene into a reaction kettle, stirring for 2 hours at normal temperature and normal pressure, carrying out programmed heating, raising the temperature at the rate of 1 ℃/min to 80 ℃, continuing to stir for 8 hours at the constant temperature, then naturally cooling to the normal temperature under the stirring condition, adding phenol which is in the same mole with the polyamine, carrying out programmed heating, raising the temperature at the rate of 0.5 ℃/min, slowly raising the temperature to 80 ℃, continuing to stir for 15 hours at the constant temperature, stopping stirring, naturally cooling to the normal temperature, standing overnight, carrying out suction filtration on the obtained mixture, sequentially washing with absolute ethyl alcohol and deionized water for three times respectively, and carrying out vacuum drying for 2 hours at 60 ℃ to obtain an off-white composite material IL-MIL-101-Cr; wherein, the polyamine is triethylene tetramine or tetraethylene pentamine, or a mixture formed by mixing the two polyamines according to any mass ratio; the phenol is phenol or guaiacol, or a mixture formed by mixing two phenols according to any mass ratio, wherein the total mole number of the phenol is equal to that of the polyamine; the loading capacity of the ionic liquid IL is 20-50% of the mass of the metal framework material MIL-101-Cr.
2. The use of an ionic liquid composite metal framework material to trap NO according to claim 1, wherein: weighing a certain amount of IL-MIL-101-Cr in a gas absorption tank, introducing NO with a certain pressure under the conditions of a certain temperature and continuous stirring, and calculating the NO absorption amount through the pressure change in the absorption tank after the absorption is balanced; wherein the partial pressure Pe of NO after balancing is 0.001-3 bar, and the preferable Pe is 0.1-3 bar; the absorption temperature is 20-100 ℃, wherein the preferable absorption temperature is 40 ℃.
3. The use of the ionic liquid composite metal framework material for capturing NO according to claim 1 and claim 2, wherein the method for absorbing NO further comprises a regeneration process of the absorbent after absorption, wherein a certain amount of the composite material IL-MIL-101-Cr which has absorbed NO is placed in a sealed tank with a pressure of 0.005 bar, the desorption temperature is controlled to be 80 ℃, the desorption equilibrium time is 1 hour, and the desorption residual amount is 0.12 mmol/g; wherein the desorption temperature is 60-120 ℃, and the preferred desorption temperature is 80 ℃; the regeneration time is 0.1-3 h, and the preferable regeneration time is 1 h.
CN202110810218.3A 2021-07-18 2021-07-18 Application of ionic liquid composite metal framework material in capturing NO Pending CN113426248A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115191479A (en) * 2022-07-15 2022-10-18 山东农业大学 Fruit preservative and preparation method and application thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115191479A (en) * 2022-07-15 2022-10-18 山东农业大学 Fruit preservative and preparation method and application thereof

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